Yeah I really like any combination of explosive rockets with poison, slow and distractors. I haven't researched 3 capsules in one ammo yet in my current world but all 3 will be great :)
Also since I'm playing with mines for defence I use the non-explosive rockets as well to not kill my own mines.
The amount of reasearch and itens combination that is added is kinda of alot
There's settings so you don't have to research individual ammo, you can just research a capsule count. But that unlocks a lot of ammo that you probably don't want to craft so it makes it hard to find the right combination in your crafting menu. And the research menu has a good tree view for finding the right combination of items and you use it not as often so it's not a big problem to have a lot of researches as it is to have too much unlocked recipes. :)